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CM_EISA_SLOT_INFORMATION structure (wdm.h)

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The CM_EISA_SLOT_INFORMATION structure defines EISA configuration header information returned by HalGetBusData for the input BusDataType = EisaConfiguration, or by HalGetBusDataByOffset for the inputs BusDataType = EisaConfiguration and Offset = 0, assuming the caller-allocated Buffer is of sufficient Length.

Syntax

typedef struct _CM_EISA_SLOT_INFORMATION {
  UCHAR  ReturnCode;
  UCHAR  ReturnFlags;
  UCHAR  MajorRevision;
  UCHAR  MinorRevision;
  USHORT Checksum;
  UCHAR  NumberFunctions;
  UCHAR  FunctionInformation;
  ULONG  CompressedId;
} CM_EISA_SLOT_INFORMATION, *PCM_EISA_SLOT_INFORMATION;

Members

ReturnCode

Contains a status code if an error occurs when the EISA BIOS is queried. Possible status codes include the following:

  • EISA_INVALID_SLOT
  • EISA_INVALID_FUNCTION
  • EISA_INVALID_CONFIGURATION
  • EISA_EMPTY_SLOT
  • EISA_INVALID_BIOS_CALL

ReturnFlags

The return flags.

MajorRevision

Information supplied by the manufacturer.

MinorRevision

Information supplied by the manufacturer.

Checksum

The checksum value, allowing validation of the configuration data.

NumberFunctions

The number at this slot.

FunctionInformation

Whether there is available CM_EISA_FUNCTION_INFORMATION for this slot.

CompressedId

The EISA compressed identification of the device at this slot. This value is identical to the CompressedId member of the CM_EISA_FUNCTION_INFORMATION structure. This member can be read to determine whether the caller should call HalGetBusData or HalGetBusDataByOffset again with sufficient buffer space to get more detailed CM_EISA_FUNCTION_INFORMATION for a device it supports.

Remarks

The information returned by HalGetBusData or HalGetBusDataByOffset in CM_EISA_SLOT_INFORMATION and in CM_EISA_FUNCTION_INFORMATION immediately following it is read-only.

The driver of an EISA device might call HalGetBusData or HalGetBusDataByOffset for each slot on each EISA bus in the system, requesting only CM_EISA_SLOT_INFORMATION in order to find the device(s) it supports by examining the returned CompressedId values. Then, such a driver could allocate sufficient buffer space to call HalGetBusData(ByOffset) again for CM_EISA_SLOT_INFORMATION and CM_EISA_FUNCTION_INFORMATION at slots where its device(s) can be found.

Requirements

Requirement Value
Header wdm.h (include Wdm.h, Ntddk.h, Ntifs.h, Miniport.h)

See also

CM_EISA_FUNCTION_INFORMATION

HalGetBusData

HalGetBusDataByOffset